How Do You Convert Celsius to Fahrenheit? (Formula, Examples & Chart)
Quick answer: use the formula °F = °C × 9/5 + 32. For example, 20 °C is 68 °F, and 100 °C is 212 °F.
Whether you're reading a foreign spec sheet, following a recipe from another country or checking homework, converting degrees Celsius to degrees Fahrenheit is one of those small skills that pays off constantly. Below you'll find the exact conversion factor, an easy mental approximation, step-by-step examples and full lookup tables.
Understanding the units
Celsius (°C)
Celsius sets 0° at water's freezing point and 100° at its boiling point at sea level. It is the world's standard scale for weather and cooking outside the US.
Fahrenheit (°F)
Fahrenheit places freezing at 32° and boiling at 212°, giving 180 finer-grained degrees between them. It remains the everyday scale of the United States.
The exact conversion formula
°F = °C × 9/5 + 32How to convert degrees Celsius to degrees Fahrenheit, step by step
- Start with your temperature in degrees Celsius.
- Apply the formula
°F = °C × 9/5 + 32. - Round to the precision you need — one decimal place is plenty for weather, none for cooking.
Worked examples:
- -40 °C → °F = -40 °F
- 0 °C → °F = 32 °F
- 25 °C → °F = 77 °F
- 45 °C → °F = 113 °F
- 90 °C → °F = 194 °F
Real-world reference points
Memorable reference points: −40° is where Celsius and Fahrenheit agree, 0 °C / 32 °F is freezing, 20–22 °C / 68–72 °F is room temperature, 37 °C / 98.6 °F is body temperature, and 100 °C / 212 °F is water boiling at sea level. These five anchors let you sanity-check any conversion instantly.
Quick lookup: 1 to 100 degrees Celsius in degrees Fahrenheit
Scan this list for the exact value you need — each line is computed with the precise conversion formula, not an approximation.
- -40 degrees Celsius = -40 degrees Fahrenheit
- -30 degrees Celsius = -22 degrees Fahrenheit
- -20 degrees Celsius = -4 degrees Fahrenheit
- -10 degrees Celsius = 14 degrees Fahrenheit
- -5 degrees Celsius = 23 degrees Fahrenheit
- 0 degrees Celsius = 32 degrees Fahrenheit
- 5 degrees Celsius = 41 degrees Fahrenheit
- 10 degrees Celsius = 50 degrees Fahrenheit
- 15 degrees Celsius = 59 degrees Fahrenheit
- 20 degrees Celsius = 68 degrees Fahrenheit
- 25 degrees Celsius = 77 degrees Fahrenheit
- 30 degrees Celsius = 86 degrees Fahrenheit
- 35 degrees Celsius = 95 degrees Fahrenheit
- 37 degrees Celsius = 98.6 degrees Fahrenheit
- 40 degrees Celsius = 104 degrees Fahrenheit
- 45 degrees Celsius = 113 degrees Fahrenheit
- 50 degrees Celsius = 122 degrees Fahrenheit
- 60 degrees Celsius = 140 degrees Fahrenheit
- 70 degrees Celsius = 158 degrees Fahrenheit
- 80 degrees Celsius = 176 degrees Fahrenheit
- 90 degrees Celsius = 194 degrees Fahrenheit
- 100 degrees Celsius = 212 degrees Fahrenheit
- 150 degrees Celsius = 302 degrees Fahrenheit
- 200 degrees Celsius = 392 degrees Fahrenheit
- 250 degrees Celsius = 482 degrees Fahrenheit
- 300 degrees Celsius = 572 degrees Fahrenheit
- 350 degrees Celsius = 662 degrees Fahrenheit
- 400 degrees Celsius = 752 degrees Fahrenheit
Celsius to Fahrenheit conversion table
The extended table below covers fractional and large values for quick reference.
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| -40 °C | -40 °F |
| -30 °C | -22 °F |
| -20 °C | -4 °F |
| -10 °C | 14 °F |
| -5 °C | 23 °F |
| 0 °C | 32 °F |
| 5 °C | 41 °F |
| 10 °C | 50 °F |
| 15 °C | 59 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 35 °C | 95 °F |
| 37 °C | 98.6 °F |
| 40 °C | 104 °F |
| 45 °C | 113 °F |
| 50 °C | 122 °F |
| 60 °C | 140 °F |
| 70 °C | 158 °F |
| 80 °C | 176 °F |
| 90 °C | 194 °F |
| 100 °C | 212 °F |
| 150 °C | 302 °F |
| 200 °C | 392 °F |
| 250 °C | 482 °F |
| 300 °C | 572 °F |
| 350 °C | 662 °F |
| 400 °C | 752 °F |
Reverse table: degrees Fahrenheit to degrees Celsius
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 °F | -40 °C |
| -30 °F | -34.4444 °C |
| -20 °F | -28.8889 °C |
| -10 °F | -23.3333 °C |
| -5 °F | -20.5556 °C |
| 0 °F | -17.7778 °C |
| 5 °F | -15 °C |
| 10 °F | -12.2222 °C |
| 15 °F | -9.4444 °C |
| 20 °F | -6.6667 °C |
| 25 °F | -3.8889 °C |
| 30 °F | -1.1111 °C |
| 35 °F | 1.6667 °C |
| 37 °F | 2.7778 °C |
| 40 °F | 4.4444 °C |
Reverse lookup: degrees Fahrenheit in degrees Celsius
- -40 degrees Fahrenheit = -40 degrees Celsius
- -30 degrees Fahrenheit = -34.44 degrees Celsius
- -20 degrees Fahrenheit = -28.89 degrees Celsius
- -10 degrees Fahrenheit = -23.33 degrees Celsius
- -5 degrees Fahrenheit = -20.56 degrees Celsius
- 0 degrees Fahrenheit = -17.78 degrees Celsius
- 5 degrees Fahrenheit = -15 degrees Celsius
- 10 degrees Fahrenheit = -12.22 degrees Celsius
- 15 degrees Fahrenheit = -9.44 degrees Celsius
- 20 degrees Fahrenheit = -6.67 degrees Celsius
- 25 degrees Fahrenheit = -3.89 degrees Celsius
- 30 degrees Fahrenheit = -1.11 degrees Celsius
- 35 degrees Fahrenheit = 1.67 degrees Celsius
- 37 degrees Fahrenheit = 2.78 degrees Celsius
- 40 degrees Fahrenheit = 4.44 degrees Celsius
- 45 degrees Fahrenheit = 7.22 degrees Celsius
- 50 degrees Fahrenheit = 10 degrees Celsius
- 60 degrees Fahrenheit = 15.56 degrees Celsius
- 70 degrees Fahrenheit = 21.11 degrees Celsius
- 80 degrees Fahrenheit = 26.67 degrees Celsius
Common mistakes to avoid
The classic temperature mistakes: applying the ×9/5 ratio without adding the 32 offset (or vice versa), using the weather shortcut ("double and add 30") in cooking where its error matters, and forgetting that temperature differences convert differently than temperatures — a change of 10 °C is a change of 18 °F, not 50 °F.
Precision and rounding
The tables above round to a few decimal places for readability. When you need full precision — engineering drawings, scientific work, legal documents — use the exact formula and round only at the very end of your calculation. Rounding intermediate steps is the most common source of conversion drift, especially when several conversions are chained together.
Convert it instantly
Skip the arithmetic entirely: our free Celsius to Fahrenheit converter computes any value as you type, and the Fahrenheit to Celsius converter handles the reverse direction. For every other temperature unit, see the complete temperature conversion guide.
Frequently asked questions
What is 30 °C in °F?
30 °C equals 86 °F, using °F = °C × 9/5 + 32.
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit read the same at −40°: −40 °C equals −40 °F exactly.
Can I do this conversion in my head?
Roughly, yes: for Celsius to Fahrenheit, double the number and add 30 — accurate to within a couple of degrees across normal weather temperatures. Going the other way, subtract 30 and halve it.
What is 75 degrees Celsius in degrees Fahrenheit?
75 degrees Celsius equals 167 degrees Fahrenheit. Apply °F = °C × 9/5 + 32.
What is 350 degrees Celsius in degrees Fahrenheit?
350 degrees Celsius equal 662 degrees Fahrenheit — a common oven temperature conversion.
Where does the formula come from?
The formula follows from how the scales are defined: they place their zero points at different physical references and use different degree sizes, so converting requires both a ratio and an offset. The definitions are international standards, so the formula never changes.
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